maybach



Feb. 6, 1923. 1,444,159 K. MAYBACH. MOTOR FEED REGULATING DEVICE.

FILED SEPT. 27. 1921. 2 SHEETS'SHEET l TNVE'NTOR WW4 Feb. s, 1923;

r K. MAYBACH.' MOTOR FEED REeuLAnNc DEVICE.

' FILED SEPT. 27, 1921 2 suaers-suzs 2 v Unve n roe,

Patented Feb. ti i923.

UNITE STATES Mi itia? PATNT QFFNYE.

KARL MAYBACH, OF FEIEIDRICHSHAFEN, GEEE/IANY, ASSIGNOB TO FIRM: DIAYBACH MOTORENBAU GESELLSCHAFLJ MIT BESCHRANKTEB I'IAFI'UNG, OF FRIEDRIOHSHAFEN A/B, GERMANY.

MIOTOR FEED REGULATING DEVICE.

Application filed September To all whom it may concern:

Be it known that I, KARL MAYBACl-I, a German citizen, residing at Friedrichshaten a/B., Germany, have invented certain new and useful Improvements in Motor-d ced Regulating Devices (tor which 1 have filed applications in Germany September 6,1920, and May 6, 1921), of which the following is a specification.

My invention refers to motor cars and other motor driven vehicles and more particularly to a special modification of the socalled accelerator serving for entirely cutting out the fuel supply as often as possible.

As is well known to those skilled'in the art, the accelerator is pedal lever serving to regulate the supply of combustible mixture to the motor. In the cars at present in use, when the accelerator is in the position of rest, the carburettor is still so far opened that the motor is still capable oirunning with no-load and at the lowest possible number of revolutions. By actuating the accelerator, viz. by pressing the pedal lever down, the throttle oi" the carburettor is opened more and more. On being released the accelerator automatically returns to its no-load position.

Up till now the accelerator was required to act in this manner inasmuch as at the moment of changing over and consequently throwing out the coupling, the motor must not come to a stop. On the other hand, this involves the drawback that also in all other cases, g., in descending a slope with the coupling thrown in the motor will perm-bu nently be supplied with some con'lbustible mixture. in a case like this the cons nnption of fuel is even higher than it would. be with the motor running under no-load inasmuch as at the higher number oi" revolutions imparted to it by the car the motor exerts a considerably greater sucking effect than on normal no-load running with a lower number of revolutions. It is moreover desirable that just in descending a slope the motor, instead of being supplied with fuel and being operated thereby, should exert a braking effect on the car.

All these drawbacks are obviated accord ing to the present invention by imparting to the accelerator a position 01": rest in which it shuts oil the supply of gas to the motor. Preferably the accelerator is locked in this 27, 1921. Serial no. 503,669.

position in such manner as to be easily released, the locking device preventing it from moving back beyond the no-load postion into the shut-oil position or carrying it back from this shutol'l' position into the no-load position whenever the motor COTl] )ll1]g is thrown out or when the starting device is being used.

In the preferred form of my invention 1 provide means for automatically releasing the locking device which prevents the accelerator from moving back into the shut-oil position, whenever the accelerator is be ng used for increasing the output of the motor.

In the drawings affixed to this specification and forming part thereof, two modifications of the device embodying my invention are illustrated diagrammatically by way oi example. In the drawIngs Fig. 1 is an elevation of one modification which merely discloses the connection between the accelerator and the coupling.

Fig. 2 is a diagram of another modilication showing the connection between the ac celerator and the coupling as well as the starting device, and further the means for releasing the locking device of the accelerator whenever this latter has been brought to act.

Referring to Fig. 1, the accelerator a rocks about the axle 7) carrying the carburettor lever c and a lever m acted upon by the spring (Z which causes lever on on being released. to move into the no-load and sliu'boli' positions respectively. Lever c actuates by means oi? rod 6 the throttle of the carburettor (not shown). The accelerator lever 11. is represented in three different positions (a, 11. of), the position a. (COIL'QSPOFQClS to the shut-oil position, in which the carlmrettor is completely closed and no-gas is supplied to the motor, while a corresponds to the noload position, in which the carburettor al lows only so much combustible mixture to pass to the motor as is required for light running. a corresponds to the open posi tion where the carburettor is completely open.

The clutch pedal f is fixed on the axle g and by turning this axle actuates the lever 7L and the clutch Z. the lever it are also represented in three different positions f, 7, f and ii, 72, 7L2, position f being the throw-in position, while f The clutch pedal f and corresponds to that position of the clutch pedal, in which the clutch just begins being released and position f corresponds to the position where the clutch is thrown out entirely. Y

According to the present invention now the clutch pedal axle g carries a further lever 2' provided with a stop k which extends across the accelerator lever a. That part of lever a on which the stop is glides, is formed like a guide in such manner that when the coupling is thrown in, the accelerator is free to move back to the shut-off position, being however carried from the shut-off position into the no-load position as soon as the clutch is thrown out, this being effected by the stop is, on the clutch pedal being forced downwards radually assuming the position and thereli causing lever a to assume the position a he operation of this device is as follows:

With the clutch thrown in (position f of the pedal lever) the accelerator can be actuated as desired, namely it can assume all three end positions a, a, a However, as soon as it is released no matter what position it had assumed, the spring d will carry it automatically back into the shut-off position a. In case now that in this position of the accelerator the coupling be thrown out, f. i. in order to change speed, the accelerator is forcibly carried by the stop is into its no-load position a the accelerator reaching this position at the moment at which the clutch is just beginning to be released (position f of the pedal lever) so that in this manner a stopping of the motor is effectively avoided.

In the modification shown in Fig. 2 the accelerator is carried automatically from the shut-ofi position into the no-load position wheinever the device for starting the motor is use Referring to Fig. 2, a bell crank lever is pivoted at q above the accelerator lever a, one arm 8 of the bell crank lever cooperating with the accelerator lever a, its other arm 25 with the device for star-tin the motor. Of this device the drawing onIy shows the easing u of a pedal switch carrying the press button 4) which on being depressed by foot will throw in and start the electric starting motor which then causes the driving motor of the car to be started, until this latter motor has reached the number of revolutions required. The rod w carrying the button 4; passes through the casing u and rests on the arm I. of the bell crank lever whenever the button 1; is pressed down and the starting motor is being operated. The arm 8 of the bell crank lever is then carried against the action of the spring on into the position shown in dotted lines and by pressing on lever a forces it to assume the position a In this position the arm 8 of the bell crank lever is caught by nose 3 which prevents the spring a: from pulling the lever back into its original position even in case that the button -v has been released and has been carried back into its position of rest.

The device described causes the accelerator lever a to be automatically carried from the shut-off position into the no-load position a as soon as the motor is being started. In consequence thereof the motor on being started is supplied with so much combustible mixture as it requires for no-load running, this being continued so long until in order to start the car running, the accelerator lever a is moved on towards the position (1, \Vhen this is being done, the nose 3 will release the arm 8 and allow the bell crank lever to return into its position of rest, thus allowing the operator to return the accelerator lever a, for instance on descending a slope to its position of rest where the motor is stopped altogether.

' s described above, with regard to the electric starting motor, in the case where the motor is started by hand, a pin may be provided which is moved at the well known axial movement of the starting crank when this latter is coupled with the starting clutch, such pin exerting the same effect as the pin to shown in Fig. 2. The pin 1' shown in the drawing is designed to represent such a device. In the case where both an electric and a hand starting device are provided, both these pins may be provided as shown in the drawing.

In order to influence the locking device for the accelerator by aid of the clutch, a cam disc 'n is fixed to the clutch pedal f, the cam 0 serving on the clutch edal being depressed to press the arm t o the bell crank lever down by aid of pin 1), thus causing the pins to cooperate as described above.

The clutch pedal may thus be caused to act on the accelerator lever of some other device.

It is not necessary that the accelerator lever remains in the position (1 correspond ing to light running of the motor, when the clutch pedal 7 is released.

I wish it to be understood that I do not desire to be limited to the exact details of construction shown and described, for obvious modifications will occur to a person skilled in the art.

I claim:

1. In a motor vehicle in combination, a motor, a motor shaft, a power transmitting shaft and a clutch adapted to couple said shafts, means for supplying fuel to said motor, a pedal lever for influencing said fuel supply means and adapted, when in its position of rest, to entirely throw out said supplying means and locking means adapted to prevent said lever from returning of itself into said position of rest, said locking means being effective when said shafts are uncoupled.

2. In a motor vehicle in combination, a. motor, a motor shaft, a power transmitting shaft and a clutch adapted to couple said shafts, means for supplying fuel to said motor, a pedal lever for influencing said fuel supply means and adapted, when in its position of rest, to entirely throw out said supplying means and locking means adapted to prevent said lever from returning of it- 'elf into said position of rest, said locking means being adapted to force said lever from its position of rest into no-load position when said shafts are uncoupled, said locking means being effective when said shafts are uncoupled.

3. In a motor vehicle in combination, a motor, a motor shaft, a power transmitting shaft and a clutch adapted to couple said shafts, means for supplying fuel to said motor, a pedal lever for influencing said fuel supply means and adapted, when in its position of rest, to entirely throw out said supplying means and locking means adapted to prevent said lever from returning of it self into said position of rest, said locking means being effective when said shafts are uncoupled and a starting device connected with said locking means in such manner that on said starting device being actuated, said lever is carried into no-load position.

4;, In a motor vehicle in combination, a motor, a motor shaft, a power transmitting into said oosition of rest said lockin means being effective when said shafts are uncoupled, a starting device and a stop adapted, on said starting device being actuated, to move said lever into no-load posisition and to be locked by said lever, until this latter is moved further.

5. In a motor vehicle in combination, a

motor, a motor shaft, a power transmitting shaft and a clutch adapted to couple said shafts, means for supplying fuel to said motor, a pedal lever for influencing said fuel supply means and adapted, when in its position of. rest, to entirely throw out said supplying means and locking means adapted to prevent said lever from returning of itself into said position of rest, said locking means being effective when said shafts are uncoupled, a starting device and. a member connected with said starting device and adapted, on said starting device being actuated, to move said lever into no load position and to be locked by said lever until this latter is moved further.

In testimony whereof I affix my signature.

KARL MAYBAGI-I. 

